Hood/Bonnet Lifting At Speed - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Kefuddle · 06-05-2013, 04:56 AM

Hi all,

Anybody else noticed this yet? At around 120kmh, I noticed the hood, just around the bulge, starts to lift. At 160kmh is looks quite ridiculous with, I would say, a 1cm vertical gap between the wing and the hood above the wheel arch. It is difficult to ascertain if the other side is behaving the same way, it moves but it doesn't seem by quite as much as the left drivers side.If following other traffic or during wind crosswind conditions, the hood just shakes.

I have adjusted the stops, checked the seals, all is OK. The alignment between left and right sides isn't spot on, but it isn't that bad either.

Not being able to identify anything obviously wrong with the car, on the face of it, this seems like a crass design flaw.

Looking forward to some sterling input

RevoG · 06-05-2013, 05:14 AM

Can't say I have ever had that problem, but then again mine has not seen anything above 150. Does it lift in the middle of the bonnet?

Fish Eagle · 06-05-2013, 05:20 AM

Never happened to me, but I'd be worried if it did because it might not be properly latched and pose a safety risk. IMO it's definately not right - I suggest that you take it to the dealer as a warranty issue and insist that they sort it out.

ft_sjo · 06-05-2013, 05:55 AM

It's normal (for a lightweight aluminium bonnet), and has been discussed in other threads. Have a search.

Guillaume · 06-05-2013, 06:11 AM

Yeah same for me, which is quite disturbing when going 200+ kph...

grodenglaive · 06-05-2013, 06:17 AM

No lift for me at track speeds, but I have the hood struts installed. That might be a convenient and cheap fix for you.

Kefuddle · 06-05-2013, 06:50 AM

Hi RevoG,

Quote:

Originally Posted by RevoG

Can't say I have ever had that problem, but then again mine has not seen anything above 150. Does it lift in the middle of the bonnet?

No, the edges, most noticeable at the top of the bulge.

RevoG · 06-05-2013, 08:06 AM

Cant remember mine ever doing it. Maybe if I saw it...

check out www.86cult.com for other local members, we have a get together next week.

Kefuddle · 06-06-2013, 04:22 AM

All,

Well, I went back to look under the hood. On each side there is a wedge seal attached to the hood that sits over the headlights. I have found this seal a little curious, as it seems pretty flimsy and to my untrained eye it looks to be the wrong way around with the pointed part of the wedge facing forwards.

Anyway, I would have thought, with that orientation, with air driving inbetween the hood and lights would force a gap in the seal. Therefore it seems to me that the angled part should be facing inwards, so that the air blast forces the wedge open and stops air entering the engine bay at the point. Funnily enough, the front end has been repaired and re-painted following a pickup dropping its load in front of me on the SMBZ road one night! Did they put it back together properly? Can anybody confirm?

With that thought in mind I cut up some pieces of old bicycle inner tube and gently wedged the pieces into the seal to force it open a bit more than it would otherwise be. Went for a drive and preseto, the hood hardly moves. It still rises a bit, but a fraction of what it did before.

I think when it is in for its 7500km I'll get Mr Futtaim to take a look. Habibi fix my car!

RevoG,
I keep meaning to try and join you guys, but I work most weekends. What to do

Hopefully sometime soon, I've joined your FB page. Hope to see you soon buddy

firl21 · 06-07-2013, 05:15 AM

Had this problem once with my lexus, The hood damn near flew off at highway speed. Might be a toyota thing. Took it in, shop did something free of charge and said good to go.

ft_sjo · 06-07-2013, 05:22 AM

The bonnet isn't lifting. It's a very thin, lightweight component which flexes with the high pressures under it at higher speeds.

Be glad you have a lightweight bonnet. It's not a problem that needs to be fixed, unless you have OCD.

Yamajee · 06-07-2013, 06:12 AM

I saw this a couple of times on really windy days and going over 130 km/h. I think it's normal for such a light hood.

Kefuddle · 06-10-2013, 12:51 PM

Just a quick update. I found a distinct improvement when blocking off airflow through the gap between the headlights and hood. Further to this, I took the car to the dealer today for it's 7500km service and they said that the panels are significantly misaligned for the hood and the nose section. I have to book the car into the body shop to have this sorted out (at their cost!). I suspect that will be the fix. Watch this space.

Black Tire · 06-12-2013, 05:04 PM

Kefuddle, I think you would be interested in reading this post:

http://www.ft86club.com/forums/showthread.php?t=28335

06-05-2013, 04:56 AM	#1
Kefuddle Member Join Date: Dec 2012 Drives: Blue manual Toyota GT86 Location: UAE Posts: 25 Thanks: 10 Thanked 5 Times in 5 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Hood/Bonnet Lifting At Speed Hi all, Anybody else noticed this yet? At around 120kmh, I noticed the hood, just around the bulge, starts to lift. At 160kmh is looks quite ridiculous with, I would say, a 1cm vertical gap between the wing and the hood above the wheel arch. It is difficult to ascertain if the other side is behaving the same way, it moves but it doesn't seem by quite as much as the left drivers side.If following other traffic or during wind crosswind conditions, the hood just shakes. I have adjusted the stops, checked the seals, all is OK. The alignment between left and right sides isn't spot on, but it isn't that bad either. Not being able to identify anything obviously wrong with the car, on the face of it, this seems like a crass design flaw. Looking forward to some sterling input

06-05-2013, 05:14 AM	#2
RevoG Senior Member Join Date: Dec 2012 Drives: Hot Lava 86 MT Location: Dubai Posts: 168 Thanks: 32 Thanked 56 Times in 36 Posts Mentioned: 9 Post(s) Tagged: 0 Thread(s)	Can't say I have ever had that problem, but then again mine has not seen anything above 150. Does it lift in the middle of the bonnet? __________________ JR Supercharger, JR RS Pulley, JR Oil cooler, JDL UEL header, Dual resonated 3" JDL Overpipe Front pipe, Perrin 3" resonated cat back exhaust, Upgraded Koyorad radiator, ECUTek tune, Enkei RS05RR 18x9.5, Bridgestone RE003 265/35/18, KW V3 Coilovers, Valenti sequential taillights, Kartboy short shifter kit

06-05-2013, 08:06 AM	#8
RevoG Senior Member Join Date: Dec 2012 Drives: Hot Lava 86 MT Location: Dubai Posts: 168 Thanks: 32 Thanked 56 Times in 36 Posts Mentioned: 9 Post(s) Tagged: 0 Thread(s)	Cant remember mine ever doing it. Maybe if I saw it... check out www.86cult.com for other local members, we have a get together next week. __________________ JR Supercharger, JR RS Pulley, JR Oil cooler, JDL UEL header, Dual resonated 3" JDL Overpipe Front pipe, Perrin 3" resonated cat back exhaust, Upgraded Koyorad radiator, ECUTek tune, Enkei RS05RR 18x9.5, Bridgestone RE003 265/35/18, KW V3 Coilovers, Valenti sequential taillights, Kartboy short shifter kit

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06-05-2013, 05:55 AM	#4
ft_sjo Banned Join Date: Oct 2012 Drives: GT86 Location: The Motherland Posts: 1,398 Thanks: 140 Thanked 473 Times in 271 Posts Mentioned: 22 Post(s) Tagged: 0 Thread(s)	It's normal (for a lightweight aluminium bonnet), and has been discussed in other threads. Have a search.

06-05-2013, 06:11 AM	#5
Guillaume Senior Member Join Date: Jul 2012 Drives: Exige S 240 Location: Belgium Posts: 732 Thanks: 319 Thanked 602 Times in 287 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Yeah same for me, which is quite disturbing when going 200+ kph...

06-06-2013, 04:22 AM	#9
Kefuddle Member Join Date: Dec 2012 Drives: Blue manual Toyota GT86 Location: UAE Posts: 25 Thanks: 10 Thanked 5 Times in 5 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	All, Well, I went back to look under the hood. On each side there is a wedge seal attached to the hood that sits over the headlights. I have found this seal a little curious, as it seems pretty flimsy and to my untrained eye it looks to be the wrong way around with the pointed part of the wedge facing forwards. Anyway, I would have thought, with that orientation, with air driving inbetween the hood and lights would force a gap in the seal. Therefore it seems to me that the angled part should be facing inwards, so that the air blast forces the wedge open and stops air entering the engine bay at the point. Funnily enough, the front end has been repaired and re-painted following a pickup dropping its load in front of me on the SMBZ road one night! Did they put it back together properly? Can anybody confirm? With that thought in mind I cut up some pieces of old bicycle inner tube and gently wedged the pieces into the seal to force it open a bit more than it would otherwise be. Went for a drive and preseto, the hood hardly moves. It still rises a bit, but a fraction of what it did before. I think when it is in for its 7500km I'll get Mr Futtaim to take a look. Habibi fix my car! RevoG, I keep meaning to try and join you guys, but I work most weekends. What to do Hopefully sometime soon, I've joined your FB page. Hope to see you soon buddy

06-07-2013, 05:15 AM	#10
firl21 Banned Join Date: Mar 2013 Drives: Scion FRS in hot lava Location: Alpharetta Posts: 57 Thanks: 1 Thanked 15 Times in 13 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Had this problem once with my lexus, The hood damn near flew off at highway speed. Might be a toyota thing. Took it in, shop did something free of charge and said good to go.

06-07-2013, 05:22 AM	#11
ft_sjo Banned Join Date: Oct 2012 Drives: GT86 Location: The Motherland Posts: 1,398 Thanks: 140 Thanked 473 Times in 271 Posts Mentioned: 22 Post(s) Tagged: 0 Thread(s)	The bonnet isn't lifting. It's a very thin, lightweight component which flexes with the high pressures under it at higher speeds. Be glad you have a lightweight bonnet. It's not a problem that needs to be fixed, unless you have OCD.

06-07-2013, 06:12 AM	#12
Yamajee Senior Member Join Date: May 2013 Drives: Rocket Bunny'd GT86 Location: Dubai Posts: 556 Thanks: 68 Thanked 144 Times in 100 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	I saw this a couple of times on really windy days and going over 130 km/h. I think it's normal for such a light hood.

06-10-2013, 12:51 PM	#13
Kefuddle Member Join Date: Dec 2012 Drives: Blue manual Toyota GT86 Location: UAE Posts: 25 Thanks: 10 Thanked 5 Times in 5 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Just a quick update. I found a distinct improvement when blocking off airflow through the gap between the headlights and hood. Further to this, I took the car to the dealer today for it's 7500km service and they said that the panels are significantly misaligned for the hood and the nose section. I have to book the car into the body shop to have this sorted out (at their cost!). I suspect that will be the fix. Watch this space.

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